JBoss EAP (Enterprise Application Platform) is an open-source Java-based application server developed by Red Hat for building and deploying enterprise Java applications. It offers a range of features, including support for multiple programming languages, advanced security features, clustering for high availability, and integration with other Red Hat technologies. It is widely used in enterprise environments for running mission-critical Java applications. The skill of working with JBoss EAP involves understanding its architecture, configuration, deployment, and management.